JPS635493A - Antiburglary apparatus for goods - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Technical Field) The present invention uses an energy field such as an electromagnetic field or a magnetic field to detect tags attached to products and prevent unpaid products from being taken out. This invention relates to a product theft prevention device.

(Background Art) FIG. 3 is an explanatory diagram showing an installation example of a conventional product theft prevention device. In the conventional example, an energy field is created by electromagnetic waves, magnetic lines of force, etc. at the entrance and exit of a supermarget, and a detector 1 is provided to detect disturbances in this energy field. When a tag 2 that has a specific effect on the energy field, such as reflection or absorption of energy, passes through this energy field, the energy field is disturbed.The tag 2 is attached to each product. Tag 2 is removed from products that have been paid for at the cash register. If an attempt is made to take out the product without paying at the register, the presence of the tag 2 will be detected by the detector 1 at the entrance and exit, and an alarm will be issued.

FIGS. 4 and 5 show circuit examples of the conventional tag 2. FIG. In the conventional example shown in FIG. 4, the electromagnetic waves received by the antenna AI are absorbed using the resonance phenomenon between the coil L and the capacitor C, and the electromagnetic field is disturbed. In addition, in the conventional example shown in FIG.
It is designed to disturb the electromagnetic field by converting it to a different frequency and re-radiating it.

On the other hand, in the field of product sales, product identification systems using barcodes called POS systems are becoming popular. This POS system is a system that attaches stickers printed with barcodes to products, reads the barcodes with a barcode reader at the cash register, determines the type and price of the sold products, and automatically creates sales tabulations. be.

When using such a PoS system and a product theft prevention device at the same time, it is necessary to attach a sticker with a barcode for the POS system printed on the product and a product theft prevention tag to the product, which reduces the aesthetic appearance of the product. There was a problem above. Furthermore, since the two systems are introduced separately, there is a problem in that the cost of the product management system as a whole becomes high.

(Object of the invention) The present invention has been made in view of the above points,
The purpose is to create a product theft prevention system and PO
To provide a product theft prevention device which unifies the tags attached to products into one by integrating with the S system and reduces the cost of the product management system as a whole.

(Disclosure of the Invention) In the product theft prevention device according to the present invention, No. 1I12
1 to 3 (as shown in 21), there are a detector 1 which forms an energy field at the entrance and exit of the product sales area and which detects disturbances in this energy field and issues an alarm; The product theft prevention device includes a tag 2 that disturbs an energy field, a product code storage section 3 that stores a product code, a code output section 4 that controls disturbance of the energy field according to the stored code, and a product account. The tag 2 is equipped with a power supply circuit section 5 that extracts energy from the energy field generated in the area and uses it as an operating power source for the code output section 4.

In the present invention, the product code is stored in the tag in the product theft prevention device, and the product code is output in the product accounting area. tags can be unified into one tag, and the cost of the product management system as a whole can be reduced.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Figure 1 is a circuit diagram of a tag 2 used in a product theft prevention device according to an embodiment of the present invention. In this embodiment, electromagnetic waves received by an antenna A are transmitted to a coil. An absorption type tag is used that utilizes the resonance phenomenon between L1 and capacitor C4 to absorb and disturb the electromagnetic field. A switch Sl is inserted in series between the antenna A1 and the LC resonant circuit. This switch S1 is normally closed. A transistor Q is connected in parallel to both ends of the LC resonant circuit, and this transistor Q is turned on and off in response to a signal outputted from the code output section 4 via a resistor R.

The code output unit 4 converts parallel data stored in the product code storage unit 3 into serial data. The operating power for the code output section 4 and the product code storage section 3 is supplied by the power supply circuit section 5. The power supply circuit section 5 is connected to the antenna A2.
It includes a diode D2 that rectifies the power received by the diode D2, and a capacitor C2 that stores the rectified output.

In a merchandise checkout area, such as a cash register, antenna A2 is supplied with sufficient power to operate the internal circuitry of tag 2. Therefore, the code output section 4 and the product code storage section 3 are operated by the power supplied from the power supply circuit section, and the transistor Q is turned on and off according to the product code.

When transistor Q is turned on, the resonant circuit does not operate;
When transistor Q is off, a resonant circuit operates. Therefore, the product code reader provided at the cash register can read the product code depending on the presence or absence of resonance in the tag 2. Here, the power supply circuit section 5 can supply power only in the product checkout area where the electromagnetic field is strong, so it will not malfunction even if there are other products near the cash register. In other words, at the cash register, 1
In order to read each product without confusing it with other products, electromagnetic waves are not emitted over a wide range, and the internal power supply circuit 5 can operate only for the target whose product code is to be read. It is designed to provide a strong electromagnetic field. In addition, in the merchandise accounting area, electromagnetic waves having a different frequency from the electromagnetic waves at the entrance/exit may be emitted, and the power supply circuit section 5 may operate only when this electromagnetic wave is received.

After the product code has been read, the switch S is turned off under the control of the code output section 4 to prevent the tag 2 from absorbing electromagnetic waves at the entrance/exit. Therefore, a product with tag 2 whose product code has been read will not generate a product theft alarm even if it passes through the doorway, and a product with tag 2 whose product code has not been read will not issue a product theft alarm even if it passes through the doorway. When the product passes through, the switch S1 remains on, so that the electromagnetic wave is absorbed at the entrance and exit, and the detector 1 issues a product theft alarm, as in the case of the conventional example shown in FIG.

Okawa 1 Figure 2 is a circuit diagram of a tag 2 used in another embodiment of the present invention. A switch S2 is connected in parallel to both ends of a diode D1 for six-frequency multiplication, in which a frequency conversion type tag is used that disturbs the electromagnetic field by converting it into a frequency and re-radiating it. This switch S2 is normally open.

A transistor Q is also connected in parallel to both ends of the diode D1, and this transistor Q is turned on and off in response to a signal output from the code output section 4 via a resistor R. The operations of the code output section 4, product code storage section 3, and power supply circuit section 5 are the same as in the embodiment shown in FIG. Note that the product code storage section 3 may be an electrical memory element, or may have a code set by a switch or the like.

In this embodiment, when transistor Q is turned on,
The frequency multiplication diode D1 does not operate, and when the transistor Q is off, the diode D1 operates. Therefore, the product code reader provided at the cash register can read the product code based on the presence or absence of the frequency-multiplied reflected wave from the tag 2.

After the product code is read, the switch S2 is turned on under the control of the code output section 4 to prevent the tag 2 from reflecting electromagnetic waves at the entrance/exit. Therefore, a product with tag 2 whose product code has been read will not generate a product theft alarm even if it passes through the doorway, and a product with tag 2 whose product code has not been read will not issue a product theft alarm even if it passes through the doorway. When the product passes through, the switch S2 remains off, so that electromagnetic waves are reflected at the entrance and exit, and the detector 1 issues a product theft alarm, as in the case of the conventional example shown in FIG.

In addition, in each of the above embodiments, the tag 2
Although an example has been shown in which switches S, S2 are provided to inhibit the operation of the tag 2 so that detection is not performed at the entrance/exit, such a switch may not be provided. In this case, each time a customer passes through the doorway, a product passing signal is sent to the POS system.
If a product passing signal is emitted when a customer who has purchased a product passes through the doorway, the cashier operator determines that the product is not stolen and issues a product passing signal for the customer who passes through the doorway without purchasing the product. When this is issued, it is determined that the product has been stolen.

(Effects of the Invention) As described above, in the present invention, the energy field formed at the entrance of the product sales area is disturbed by the tag attached to the product to detect the passage of the product. The anti-theft device includes a product code storage unit that stores a product code, a code output unit that controls disturbance of the energy field according to the stored code, and a code output unit that extracts energy from the energy field generated in the product accounting area. Although the power supply circuit section that serves as the operating power source for the code output section is installed inside the tag, the identification of the product code in the product accounting area and the detection of the passage of the product at the entrance/exit of the product sales area are all performed in one tag. This has the effect of reducing the cost of the product management system as a whole.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is a circuit diagram of another embodiment of the present invention, and FIG. 3 is an explanatory diagram showing an installation example of a conventional general product theft prevention device. 4 and 5 are circuit diagrams of tags used in conventional product theft prevention devices. 1 is a detector, 2 is a tag, 3 is a product code storage section, 4 is a code output section, and 5 is a power supply circuit section.

Claims (1)

[Claims] (1) Create an energy field at the entrance to the product sales area,
The product theft prevention device includes a detector that detects disturbances in the energy field and issues an alarm, and a tag that is attached to the product and disturbs the energy field. The tag is equipped with a code output section that controls the disturbance of the energy field according to the generated code, and a power circuit section that extracts energy from the energy field generated in the product accounting area and uses it as an operating power source for the code output section. A product theft prevention device characterized by comprising: